Preparation

Prepare barbecue (medium-high heat). Thread jalapeño and garlic clove onto metal skewer. Brush jalapeño, garlic, fish, and red bell peppers with oil; sprinkle with salt and pepper. Sprinkle fish with 1/2 teaspoon cumin and 1/2 teaspoon coriander. Grill fish, bell peppers,jalapeño, and garlic until vegetables are tender and charred and fish is just cooked through, about 4 minutes per side for fish and 8 minutes per side for vegetables. Grill lemon, cut side down, until charred, about 3 minutes. Transfer fish to plate and tent with foil to keep warm.